[NSRCA-discussion] LiPo Fun Fact 'O The Day

[chuenkan at comcast.net]

Well, very few of us in NSRCA are molecular scientists -- my science runs toward the biopsychology, robotics and nuclear sciences -- and are not likely to have read the papers you mention. 

"Endothermic" does NOT mean "gets colder"! Below is the definition of "endothermic": 

Endothermic -- adjective 
1. Chemistry. noting or pertaining to a chemical change that is accompanied by an absorption of heat (opposed to exothermic ). 
2. Z oology, warm-blooded . 

It really means "generating heat internally". 

Phil Spelt, KCRC Emeritus, Secretary 
AMA 1294, Scientific Leader Member 
SPA L-18, Board Member 
(865) 435-1476v (865) 604-0541c 


----- Original Message -----



Not silly at all. You didn’t account for the chemical reaction of the electrolyte during the charge process. 



The term the PhD’s use to describe the reaction is “endothermic”(gets colder) and has to do with that whole “energy cannot be created or destroyed, just moved around” rule. 



There are several papers on the internet written by the molecular scientists who designed LiPos. 



-Keith Hoard 
-klhoard at outlook.com 







From: Ed Alt 
Sent: Friday, October 9, 2015 21:09 
To: Keith Hoard 
Cc: chuenkan at comcast.net;General pattern discussion 
Subject: Re: [NSRCA-discussion] LiPo Fun Fact 'O The Day 






That wasn't a guess, it was a statement of fact. This is getting silly. 



On Oct 9, 2015, at 9:09 PM, Keith Hoard < klhoard at outlook.com > wrote: 





Nope. If you had another guess? 

Sent from my iPad 





On Oct 9, 2015, at 20:09, Ed Alt < ed_alt at hotmail.com > wrote: 

<blockquote>



They do warm up when charging, even at low rates. It's the physics behind Ohms law that governs some of that. It may not be very noticeable, but it is happening nonetheless. 



On Oct 9, 2015, at 8:03 PM, Phil Spelt via NSRCA-discussion < nsrca-discussion at lists.nsrca.org > wrote: 

<blockquote>



I would say "C" below: I have never had a lipo pack get warm during charging. That's because i always charge somewhere between 1.8-2.0 C. For my electric planes I buy enough batteries so I do not have to hurry-charge in order to get back into the air. I charge the lipos in my starter & glow igniter at home in the shop when I have plenty of time. Now, in the interest of full disclosure, I do not use $150.00 battery packs, and none of my electric planes are for pattern. 





Phil Spelt, KCRC Emeritus, Secretary 
AMA 1294, Scientific Leader Member 
SPA L-18, Board Member 
(865) 435-1476v (865) 604-0541c 









During charging, a LiPo battery becomes: 



A) Warmer 

B) Colder 

C) None of the above 

D) All of the above 



--Keith Hoard 

-- klhoard at outlook.com 





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</blockquote>


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